Update MacOS to Catalina or Mojave for least problems with Stan-based software?

After a few attempts (warnings, Xcode requested to be downloaded so I did, etc) I think it’s working fine. I’ve tried the example(stan_model, package = "rstan", run.dontrun = TRUE) code, and there were no issues, so I’ll just start working and check back if I hit any roadblocks. Thanks for the help.

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